Summary: Supabase has open-sourced its Edge Runtime for self-hosting Deno Edge Functions. The Edge Runtime is a web server written in Rust that uses a custom Deno runtime, and it can serve TypeScript, JavaScript, and WASM functions. It also supports JWT verification, import maps, and passing custom environment variables, and it hot-reloads local changes, giving developers a seamless development experience. The Edge Runtime improves Dev/Prod parity for Edge Functions by exposing the same APIs available in the Deno Deploy Runtime, and it also allows developers to simulate their functions' resource usage and handle the behavior if they run into the limits. Supabase has put together a demo on how to self-host edge functions on Fly.io, and developers can try it themselves by following the steps provided.